Dupo is a village in St. Clair County, Illinois, home to about 3,879 people across 6.4 square miles. Its ZIP codes are 62239 and 62240, and parts of 62236 are in Dupo too.
Homes sold for a median of $102 per square foot across 2 ZIP codes in the three months ending August 2026, and all of them were seller’s markets.
Mostly Dupo; also Cahokia
Mostly Dupo; also East Carondelet and Cahokia
Mostly Columbia; part is in Dupo
Each card is that ZIP code’s whole market, including any part outside Dupo. Seller’s market: under 4 months of supply; buyer’s market: over 6. Methodology
We’re writing up Dupo’s story and what everyday life there is like, for people thinking about moving in.
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| Nearest major airport | St. Louis Lambert International Airport (STL)18 miles away |
|---|---|
| Nearest city of 250,000+ | St. Louis, MO9 miles away |
| Nearest city of 1 million+ | Chicago, IL265 miles away |
Straight-line distances from the center of Dupo; driving is longer.
Source: Airports from OurAirports (scheduled passenger service); city centers and populations from the U.S. Census Bureau.
Source: Members of Congress from the congress-legislators project; districts from the Census Bureau’s relationship files; governor and mayor from Wikidata.
Dupo had 3,996 residents in the 2020 census, up 2% since 2000.
It’s the 385th largest of 1,450 towns in Illinois by population.
St. Clair County grew from 86,685 residents in 1900 to 257,400 in 2020.
St. Clair County, 1900–2020
Source: U.S. Census Bureau decennial censuses (counties 1900–1990 from the Bureau’s historical county file).
Average highs peak around 89°F in summer, and winter lows average 22°F. About 42.9 inches of rain and melted snow fall in a typical year, with about 14 inches of snow.
Source: NOAA 1991–2020 climate normals, Cahokia, IL weather station (4 miles away).
72,871 jobs at 4,973 businesses in St. Clair County. The biggest industries by employees:
Source: U.S. Census Bureau County Business Patterns 2022 (private employers; jobs counted where people work).
13 doctors and other health care providers list an office in Dupo’s ZIP codes.
Nearest hospitals
Providers with an office here
| Primary care doctors | 1 |
|---|---|
| Dentists | 6 |
| Nurse practitioners and physician assistants | 1 |
| Mental health providers | 4 |
| Chiropractors | 1 |
| Pharmacies | 1 |
Source: Hospitals from CMS Hospital General Information (ratings are CMS overall star ratings); straight-line distances; providers from the CMS National Plan and Provider Enumeration System (NPPES), by practice address and primary specialty.
Parks (4 nearby)
Grocery stores
Pharmacies (1 nearby)
Libraries (1 nearby)
Museums
Theaters and performance venues
Counts are within about 2 miles of the center of town.
Source: Map data © OpenStreetMap contributors (openstreetmap.org/copyright), as mapped by volunteers; it can miss places or include closed ones.
Established in 1750.
Source: Wikidata (wikidata.org), the free knowledge base; people are listed by place of birth.
Public schools here are run by Comm Unit School District No 196. Check each district’s attendance zones for a specific address.
| School | Grades | Students | Type | Distance |
|---|---|---|---|---|
| Bluffview Elem SchoolDupo | Pre-K–6 | 501 | Public | 0.5 mi |
| Dupo Jr High SchoolDupo | 7–8 | 124 | Public | 0.3 mi |
| Dupo High SchoolDupo | 9–12 | 259 | Public | 0.3 mi |
Source: U.S. Department of Education, NCES: Common Core of Data (2024-2025) for public schools. Listed by address; we don’t rate schools.
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Shares ZIP codes with Columbia, East Carondelet and Cahokia.
Town boundaries don’t always match ZIP codes: a ZIP code can cross into neighboring towns, and a town can share a ZIP code with its neighbors. Facts describe the town itself; market figures describe whole ZIP codes.